Problem with unraised pots - need help!

My green line seems to be permanently stuck around 0 (0.16BB/100h over 30 000 hands on iPoker)
, so I am slowly going over my stats to find leaks. After doing a quiz I realised that one of the problems might be playing in unraised pots.

After I entered filter "called with previous limpers" on PT3 I had a downward slope with a winrate of -25 BB/100h. Both showdown (-15BB/100h) and non-showdown (-10BB/100h) are below zero.

Can anyone please check this result on their stats and post it here for comparison? And maybe a coach can tell what an average winrate should be?